JPH04187957A - Freezing cycle device - Google Patents

Abstract

PURPOSE:To improve heat efficiency by a method wherein a body case of an oil separator is connected integrally with an upper part of a body case of an accumulator and a capillary tube to introduce oil part separated from refrigerant by the oil separator into the body case of the accumulator is provided. CONSTITUTION:Gaseous refrigerant of high temperature and high pressure discharged from a compressor flows into an oil separator body case 23a of an oil separator integrated accumulator 21 through a high pressure entrance pipe 23e, and oil part of the gaseous refrigerant is separated through a demister 23c. The oil part separated by an oil separator part 23 is filtered by a strainer 23b and received by a conical upper end part 23d1 of a capillary tube 23d. The oil part is further introduced into an accumulator body case 22a through capillary upper and lower end parts 23d2 and accumulated above an inner bottom part. In an oil separator part 23, the accumulator body 22a is heated by radiation of the gaseous refrigerant of high temperature and high pressure inside the body case, so that the introduced gaseous refrigerant is heated and its evaporation is promoted. On the other hand, the accumulator body case 22a cools the oil separator body case 23a by evaporation latent heat of liquid refrigerant in the case 22a.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a refrigeration cycle device used in a refrigeration system for a refrigerated vehicle, and particularly relates to a refrigeration cycle device that integrates an oil separator and an accumulator. Related to cycle equipment.

(Prior art) Conventionally, the refrigeration cycle of this type of refrigeration cycle device is
As shown in the figure, compressor 1, oil separator 2
, a condenser 4 with a fan 3, a liquid tank 5, an expansion valve 6, an evaporator 8 with a fan 7, and an accumulator 9 are sequentially and annularly connected in this order by a refrigerant pipe 10 to form a closed loop for circulating refrigerant.

The high-temperature, high-pressure gaseous refrigerant compressed by the compressor 1 separates and removes oil in the oil separator 2, and then flows into the condenser 4. The oil separated in the oil separator 2 passes through the oil return pipe 11. The air is returned to the compressor 1 through the air.

The scum-like refrigerant that has flowed into the condenser 4 is cooled here and condensed into a liquid refrigerant, and this liquid refrigerant is stored in a liquid refrigerant tank 5 to remove excess liquid, and then is depressurized by an expansion valve 6 and flows into an evaporator 8. do. In the evaporator 8, the liquid refrigerant evaporates and cools the surrounding temperature by absorbing heat, and flows into the accumulator 9 as a low-temperature, low-pressure gaseous refrigerant.

The accumulator 9 transfers only the scum refrigerant to the compressor 1.
The liquid is returned to the suction side to prevent liquid back up.

(Problem to be solved by the invention) However, in such conventional refrigeration cycle devices, the heat released from the oil separator 2 and the latent heat of vaporization of the liquid refrigerant in the accumulator 9 are not utilized and are discarded. Since the oil separator 2 and the accumulator 9 are constructed as separate parts, the number of parts is large, which increases the number of assembly steps, which reduces the reliability of the device, and increases the installation space, which hinders compactness. The problem is that

The present invention was developed in consideration of these circumstances, and its purpose is to provide a refrigeration cycle device that can both improve thermal efficiency and be more compact.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention is configured as follows.

In other words, this invention includes an oil separator that separates oil from the refrigerant by passing a high-temperature, high-pressure gaseous refrigerant into a demister built into the main body case, and an oil separator that separates oil from the refrigerant by passing a high-temperature, high-pressure gaseous refrigerant into the main body case, and a low-temperature, low-pressure gaseous refrigerant that is introduced into the main body case to form a gas liquid. In the refrigeration cycle apparatus, the refrigeration cycle apparatus includes an accumulator that separates the gas refrigerant from the refrigerant and returns the gas refrigerant to the compressor. The present invention is characterized in that a capillary tube is provided for introducing oil into the main body case of the accumulator.

(Operation) The high-temperature, high-pressure gaseous refrigerant from the compressor passes through a demister in the main body case of the oil separator to separate oil, and then flows into the condenser where it is cooled, condensed, and liquefied.

This liquid refrigerant is evaporated in an evaporator, absorbs heat from the surroundings, and is cooled while being vaporized.

This vaporized gaseous refrigerant flows into the main body case of the accumulator, where the liquid component of the refrigerant is stored, while the gas component is returned to the compressor to prevent liquid back up.

Since the main body of the oil separator is integrally connected to the upper part of the main body case of the accumulator, the heat dissipation of the high temperature and high pressure gaseous refrigerant in the main body case of the oil separator causes the low temperature and low pressure inside the main body case of the accumulator to be released. The gaseous refrigerant can be heated to accelerate the evaporation of the liquid refrigerant therein.

Further, since the latent heat of vaporization of the liquid refrigerant within the main body case of the accumulator cools the high temperature and high pressure gaseous refrigerant within the main body case of the oil separator, the cooling efficiency of the refrigerant by the next stage condenser can be increased.

In other words, since the latent heat of vaporization of the liquid refrigerant in the accumulator and the heat radiation of the refrigerant in the oil separator are utilized together,
It is possible to improve thermal efficiency.

Furthermore, since the oil separated within the main body case of the oil separator is introduced into the main body case of the accumulator through the capillary tube, it is possible to omit the conventional oil return pipe that connects the oil separator and the compressor. Since the oil separator and the accumulator are integrated, the number of parts can be reduced accordingly, and the device can be made more compact.

(Example) Hereinafter, an example of the present invention will be described based on FIG. 1.

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of the present invention, and in the figure, an oil separator-integrated accumulator 21
The main feature is that the accumulator section 22 and the oil separator section 23 are integrated.

The accumulator section 22 is constructed almost in the same way as the conventional accumulator 9 shown in FIG.
A low pressure outlet pipe 22C is provided at the bottom of each pipe.

The outlet side of the evaporator 8 shown in FIG. 2 is connected to the outer end of the low-pressure inlet pipe 22b, so that the low-pressure, low-temperature gaseous refrigerant from the evaporator 8 is introduced into the main body case 22a.

The low pressure outlet pipe 22c has its inner end 22c1 connected to the main body case 2.
2a rises almost vertically inward from the center of the inner bottom, and terminates and opens in the upper part above the inner opening of the low-pressure inlet pipe 22b, and the inner base end of the inner end 23c1 is filled with oil. A return hole 22c2 is formed so that the oil accumulated on the inner bottom of the main body case 22a is returned to the compressor 1 together with the refrigerant through the oil return hole 22c2. The bottom open end of the accumulator section 22 is integrally and airtightly connected to the top cover of the main body case 22a of the accumulator section 22 in a coaxial manner.

In addition, a strainer 23b is fixed inside the main body case 23a to partition the interior into upper and lower parts, and a demister 23c is placed above the strainer 23b.
and a capillary tube 23d is built in below.

The main body case 23a has a high pressure inlet pipe 23e on the side of the body above the strainer 23b, and a high pressure outlet pipe 23 on the upper end thereof.
f are connected to each other.

The refrigerant discharge ratio side of the compressor 1 shown in FIG. 2 is connected to the outer end of the high-pressure inlet pipe 23e, and the refrigerant inlet side of the condenser 4 is connected to the outer end of the high-pressure inlet pipe 23f.

The capillary tube 23d has its inlet end 23d opened in oil, then spirally wound, and its outlet end connected to a small pipe 23d2 with a slightly larger diameter that penetrates the upper cover of the main body case 22a of the accumulator section 22. is connected to. For this purpose, the main body case 23a of the oil separator section 23
The oil accumulated on the inner bottom of the capillary tube 2
3d allows the accumulator section 22 to be introduced into the main body case 22a.

Therefore, the oil separator section 23 introduces the high-temperature, high-pressure gaseous refrigerant from the compressor 1 into the main body case 23a through the high-pressure inlet pipe 23e, and hits the demister 23c to separate oil from the refrigerant. Thereafter, the refrigerant is allowed to flow out from the high-pressure outlet pipe 23f to the condenser 4, and the oil separated here can be introduced into the main body case 22a of the accumulator section 22 through the capillary tube 23d.

Next, the operation of this embodiment will be explained.

The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 1 shown in FIG. 2 passes through the high-pressure inlet pipe 23e into the main body case 23a of the oil separator section 23 of the oil separator-integrated accumulator 21 shown in FIG. inflow,
Here, the refrigerant gaseous oil is separated through the demister 23C and flows into the condenser 4 through the high-pressure outlet pipe 23f.

The oil separated in the oil separator part 23 is filtered by a strainer 23b, and then received by the conical upper end part 23dl of the capillary tube 23d, and is sent to the upper and lower end parts of the capillary tube 23d.
3d2 to the main body case 22 of the accumulator section 22.
a and is deposited on its inner bottom.

On the other hand, the gaseous refrigerant that has flowed into the condenser 4 is cooled by dissipating heat there, while being condensed into liquid refrigerant.

This liquid refrigerant stores the excess amount in the liquid tank 5, is depressurized by the expansion valve 6, and flows into the evaporator 8.
It evaporates here and uses its latent heat of evaporation to absorb surrounding heat and cool it, while evaporating and becoming a gaseous refrigerant, which becomes the accumulator part 2 of the oil separator-integrated accumulator 21.
2 into the main body case 22a from its low pressure inlet pipe 22b.

Inside the main body case 22a, the liquid component in the refrigerant is stored on the inner bottom, while the gas component is returned to the suction side of the compressor from the inner end 22C1 of the low-pressure outlet pipe through the refrigerant pipe 10. This prevents a portion of the liquid from returning to the compressor and causing a liquid hammer phenomenon.

The oil separator part 23 of the oil separator-integrated accumulator 21 radiates heat by introducing a high-temperature, high-pressure gaseous refrigerant into its main body case. The main body case 22a of the accumulator section 22 is heated.

For this purpose, the gaseous refrigerant introduced into the main body case 22a of the accumulator section 220 through the low-pressure inlet pipe 22b can be heated to promote vaporization.

On the other hand, since the main body case 22a of the accumulator section 22 is cooled by the latent heat of vaporization of the liquid refrigerant therein, the main body case 23a of the oil separator section 23 can be cooled by this cooling.

Therefore, the high-temperature, high-pressure gaseous refrigerant introduced into the main body case 23a can be cooled, and the cooling efficiency in the next-stage condenser 4 can be increased.

That is, the heat dissipation of the oil separator section 23 and the cooling heat of the main body case 22a of the accumulator section 22 can be utilized together, and thermal efficiency can be improved.

In addition, the oil separated in the oil separator section 23 is introduced into the main body case 22a of the accumulator 22 through the capillary tube 23d, and the oil is returned to the compressor 1 through the low-pressure outlet pipe 22c. Since the return pipe 11 can be omitted and the oil separator section 23 and the accumulator section 22 are integrated, the number of parts can be reduced and the device can be made more compact.

〔Effect of the invention〕

As explained above, in this invention, since the oil separator and the accumulator are integrated, the heat dissipation of the oil separator and the cooling heat of the accumulator can be utilized together, so that thermal efficiency can be improved.

Further, by integrating the oil separator and the accumulator and providing a capillary tube, the conventional oil return pipe can be omitted, so that the apparatus can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a main part of an embodiment of a refrigeration cycle device according to the present invention, and FIG. 2 is a refrigeration cycle diagram of a conventional refrigeration cycle device. 1... Compressor, 2... Oil separator, 4
... Capacitor, 8... Evaporator, 9... Accumulator, 11... Oil return pipe, 21...
・Accumulator with integrated oil separator, 22...
・Accumulator part, 22a...main case, 23・
...Oil separator part, 23a...Main case, 2
3b...Strainer, 23c...Demister, 23d
...Capillary tube. 23! Figure 1

Claims (1)

[Claims] There is an oil separator that separates oil from the refrigerant by passing a high-temperature, high-pressure gaseous refrigerant through a demister built into the main body case, and an oil separator that separates oil from the refrigerant by introducing a low-temperature, low-pressure gaseous refrigerant into the main body case and separating it into gas and liquid. In the refrigeration cycle device, the main body case of the oil separator is integrally connected to the upper part of the main body case of the accumulator, and the oil separated from the refrigerant by the oil separator is transferred to the main body of the accumulator. A refrigeration cycle device characterized by having a capillary tube introduced into a case.